Ok...
A compression system is simply a bolt and a starnut. The starnut goes into the bottom of your bars. The bolt goes up through the bottom of the forks and typically there is a hole designed for it on aftermarket forks, which the bolt sits in. You then thread the bolt into the starnut and tighten, causing the bars to become tight on the headset. Finally you clamp the bars with any old clamp to stop movement. Hey presto.
Stock forks cannot do this because of not only their threads, but there is nowhere for the bolt to sit. And there's basically no point having compression on stocks anyway.